add PoCo preferredUsername for nickname in Profile::asActivityNoun()
add PoCo preferredUsername for nickname in Profile::asActivityNoun()

Piratas/tortuga,brion/StatusNet,gnusocial/mainline,bankonme/gnu-social,brion/StatusNet,sikevux/bsk-social,chimo/social,foocorp/gnu-social,foocorp/gnu-social,gnusocial/mainline,Piratas/tortuga,xebia/statusnet-oauth2,charlycoste/StatusNet,csarven/statusnet,minmb/statusnet,bankonme/gnu-social,charnimda/lgbtpzn-social,bankonme/gnu-social,zh/statusnet,studio666/gnu-social,d3vgru/StatusNet,brion/StatusNet,UngPirat/freesocial,faulteh/gnu-social,zh/statusnet,foocorp/gnu-social,xebia/statusnet-oauth2,csarven/statusnet,znarf/statusnet-ladistribution,furtherfield/gnu-social,zcopley/StatusNet,UngPirat/freesocial,UngPirat/freesocial,shashi/StatusNet,zcopley/StatusNet,studio666/gnu-social,minmb/statusnet,charlycoste/StatusNet,charlycoste/StatusNet,faulteh/gnu-social,chimo/social,zcopley/zcopleys-statusnet-clone,faulteh/gnu-social,studio666/gnu-social,zcopley/StatusNet,Piratas/tortuga,minmb/statusnet,d3vgru/StatusNet,zh/statusnet,zcopley/zcopleys-statusnet-clone,Piratas/tortuga,faulteh/gnu-social,znarf/statusnet-ladistribution,d3vgru/StatusNet,shashi/StatusNet,bankonme/gnu-social,furtherfield/gnu-social,xebia/statusnet-oauth2,sikevux/bsk-social,studio666/gnu-social,gnusocial/mainline,eXcomm/gnu-social,sikevux/bsk-social,eXcomm/gnu-social,charnimda/lgbtpzn-social,gnusocial/mainline,eXcomm/gnu-social,shashi/StatusNet,zcopley/zcopleys-statusnet-clone,znarf/statusnet-ladistribution,eXcomm/gnu-social,furtherfield/gnu-social,furtherfield/gnu-social,csarven/statusnet,csarven/statusnet,sikevux/bsk-social,charnimda/lgbtpzn-social,chimo/social